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Try: egrep '/s..._[^/]+$' file

find "$PWD" -type d -name "${PWD##*/}"

You are trying to find files with duplicate names in a directory tree. Yes?
I would try something like this:

#!/bin/ksh
find $1 -type f |
while read fname
do
d=dirname($fname)
...

Something similar to this?

find "/cat" -xdev -type d -name "cat" -print | sort | while read dir
do
echo "${dir}"
cd "${dir}"
ls -ld * | grep \^\d # Directories only
...